The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Kimberly A Prather - One of the best experts on this subject based on the ideXlab platform.

  • mass spectrometry of Atmospheric Aerosols recent developments and applications part i off line mass spectrometry techniques
    Mass Spectrometry Reviews, 2012
    Co-Authors: Kerri A. Pratt, Kimberly A Prather
    Abstract:

    Many of the significant advances in our understanding of Atmospheric particles can be attributed to the application of mass spectrometry. Mass spectrometry provides high sensitivity with fast response time to probe chemically complex particles. This review focuses on recent developments and applications in the field of mass spectrometry of Atmospheric Aerosols. In Part II of this two-part review, we concentrate on real-time mass spectrometry techniques, which provide high time resolution for insight into brief events and diurnal changes while eliminating the potential artifacts acquired during long-term filter sampling. In particular, real-time mass spectrometry has been shown recently to provide the ability to probe the chemical composition of ambient individual particles <30 nm in diameter to further our understanding of how particles are formed through nucleation in the atmosphere. Further, transportable real-time mass spectrometry techniques are now used frequently on ground-, ship-, and aircraft-based studies around the globe to further our understanding of the spatial distribution of Atmospheric Aerosols. In addition, coupling aerosol mass spectrometry techniques with other measurements in series has allowed the in situ determination of chemically resolved particle effective density, refractive index, volatility, and cloud activation properties. © 2011 Wiley Periodicals, Inc., Mass Spec Rev 31:17–48, 2012

  • mass spectrometry of Atmospheric Aerosols recent developments and applications part ii on line mass spectrometry techniques
    Mass Spectrometry Reviews, 2012
    Co-Authors: Kerri A. Pratt, Kimberly A Prather
    Abstract:

    Many of the significant advances in our understanding of Atmospheric particles can be attributed to the application of mass spectrometry. Mass spectrometry provides high sensitivity with fast response time to probe chemically complex particles. This review focuses on recent developments and applications in the field of mass spectrometry of Atmospheric Aerosols. In Part II of this two-part review, we concentrate on real-time mass spectrometry techniques, which provide high time resolution for insight into brief events and diurnal changes while eliminating the potential artifacts acquired during long-term filter sampling. In particular, real-time mass spectrometry has been shown recently to provide the ability to probe the chemical composition of ambient individual particles <30 nm in diameter to further our understanding of how particles are formed through nucleation in the atmosphere. Further, transportable real-time mass spectrometry techniques are now used frequently on ground-, ship-, and aircraft-based studies around the globe to further our understanding of the spatial distribution of Atmospheric Aerosols. In addition, coupling aerosol mass spectrometry techniques with other measurements in series has allowed the in situ determination of chemically resolved particle effective density, refractive index, volatility, and cloud activation properties.

  • Mass spectrometry of Atmospheric Aerosols-Recent developments and applications. Part I: Off-line mass spectrometry techniques: MASS SPECTROMETRY OF Atmospheric Aerosols-PART I
    Mass Spectrometry Reviews, 2011
    Co-Authors: Kerri A. Pratt, Kimberly A Prather
    Abstract:

    Many of the significant advances in our understanding of Atmospheric particles can be attributed to the application of mass spectrometry. Mass spectrometry provides high sensitivity with a fast response time to probe chemically complex particles. This review focuses on recent developments and applications in the field of mass spectrometry of Atmospheric Aerosols. In Part I of this two-part review, we concentrate on off-line mass spectrometry techniques, which require sample collection on filters but can provide detailed molecular speciation. In particular, off-line mass spectrometry techniques utilizing tandem mass spectrometry experiments and high resolution mass analyzers provide improved insight into secondary organic aerosol formation and heterogeneous reaction pathways through detailed structural elucidation at the molecular level.

  • Analysis of Atmospheric Aerosols
    Annual review of analytical chemistry (Palo Alto Calif.), 2008
    Co-Authors: Kimberly A Prather, Courtney D. Hatch, Vicki H. Grassian
    Abstract:

    Aerosols represent an important component of the Earth's atmosphere. Because Aerosols are composed of solid and liquid particles of varying chemical complexity, size, and phase, large challenges exist in understanding how they impact climate, health, and the chemistry of the atmosphere. Only through the integration of field, laboratory, and modeling analysis can we begin to unravel the roles Atmospheric Aerosols play in these global processes. In this article, we provide a brief review of the current state of the science in the analysis of Atmospheric Aerosols and some important challenges that need to be overcome before they can become fully integrated. It is clear that only when these areas are effectively bridged can we fully understand the impact that Atmospheric Aerosols have on our environment and the Earth's system at the level of scientific certainty necessary to design and implement sound environmental policies.

Berko Sierau - One of the best experts on this subject based on the ideXlab platform.

  • spectral absorption properties of Atmospheric Aerosols
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: Robert Bergstrom, P K Quinn, Peter Pilewskie, Jens Redemann, Tami C Bond, Philip B. Russell, Berko Sierau
    Abstract:

    We have determined the solar spectral absorption optical depth of Atmospheric Aerosols for specific case studies during several field programs (three cases have been reported previously; two are new results). We combined airborne measurements of the solar net radiant flux density and the aerosol optical depth with a detailed radiative transfer model for all but one of the cases. The field programs (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained Aerosols representing the major absorbing aerosol types: pollution, biomass burning, desert dust and mixtures. In all cases the spectral absorption optical depth decreases with wavelength and can be approximated with a power-law wavelength dependence (Absorption Angstrom Exponent or AAE). We compare our results with other recent spectral absorption measurements and attempt to briefly summarize the state of knowledge of aerosol absorption spectra in the atmosphere. We discuss the limitations in using the AAE for calculating the solar absorption. We also discuss the resulting spectral single scattering albedo for these cases.

  • Spectral absorption properties of Atmospheric Aerosols
    Atmospheric Chemistry and Physics Discussions, 2007
    Co-Authors: R. W. Bergstrom, P K Quinn, Peter Pilewskie, Jens Redemann, Tami C Bond, Philip B. Russell, Berko Sierau
    Abstract:

    We have determined the solar spectral absorption optical depth of Atmospheric Aerosols for specific case studies during several field programs (three cases have been reported previously; two are new results). We combined airborne measurements of the solar net radiant flux density and the aerosol optical depth with a detailed radiative transfer model for all but one of the cases. The field programs (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained Aerosols representing the major absorbing aerosol types: pollution, biomass burning, desert dust and mixtures. In all cases the spectral absorption optical depth decreases with wavelength and can be approximated with a power-law wavelength dependence (Absorption Angstrom Exponent or AAE). We compare our results with other recent spectral absorption measurements and discuss the limitations in using the AAE for calculating the solar absorption. We also discuss the resulting spectral single scattering albedo for these cases.

Kerri A. Pratt - One of the best experts on this subject based on the ideXlab platform.

  • mass spectrometry of Atmospheric Aerosols recent developments and applications part ii on line mass spectrometry techniques
    Mass Spectrometry Reviews, 2012
    Co-Authors: Kerri A. Pratt, Kimberly A Prather
    Abstract:

    Many of the significant advances in our understanding of Atmospheric particles can be attributed to the application of mass spectrometry. Mass spectrometry provides high sensitivity with fast response time to probe chemically complex particles. This review focuses on recent developments and applications in the field of mass spectrometry of Atmospheric Aerosols. In Part II of this two-part review, we concentrate on real-time mass spectrometry techniques, which provide high time resolution for insight into brief events and diurnal changes while eliminating the potential artifacts acquired during long-term filter sampling. In particular, real-time mass spectrometry has been shown recently to provide the ability to probe the chemical composition of ambient individual particles <30 nm in diameter to further our understanding of how particles are formed through nucleation in the atmosphere. Further, transportable real-time mass spectrometry techniques are now used frequently on ground-, ship-, and aircraft-based studies around the globe to further our understanding of the spatial distribution of Atmospheric Aerosols. In addition, coupling aerosol mass spectrometry techniques with other measurements in series has allowed the in situ determination of chemically resolved particle effective density, refractive index, volatility, and cloud activation properties.

  • mass spectrometry of Atmospheric Aerosols recent developments and applications part i off line mass spectrometry techniques
    Mass Spectrometry Reviews, 2012
    Co-Authors: Kerri A. Pratt, Kimberly A Prather
    Abstract:

    Many of the significant advances in our understanding of Atmospheric particles can be attributed to the application of mass spectrometry. Mass spectrometry provides high sensitivity with fast response time to probe chemically complex particles. This review focuses on recent developments and applications in the field of mass spectrometry of Atmospheric Aerosols. In Part II of this two-part review, we concentrate on real-time mass spectrometry techniques, which provide high time resolution for insight into brief events and diurnal changes while eliminating the potential artifacts acquired during long-term filter sampling. In particular, real-time mass spectrometry has been shown recently to provide the ability to probe the chemical composition of ambient individual particles <30 nm in diameter to further our understanding of how particles are formed through nucleation in the atmosphere. Further, transportable real-time mass spectrometry techniques are now used frequently on ground-, ship-, and aircraft-based studies around the globe to further our understanding of the spatial distribution of Atmospheric Aerosols. In addition, coupling aerosol mass spectrometry techniques with other measurements in series has allowed the in situ determination of chemically resolved particle effective density, refractive index, volatility, and cloud activation properties. © 2011 Wiley Periodicals, Inc., Mass Spec Rev 31:17–48, 2012

  • Mass spectrometry of Atmospheric Aerosols-Recent developments and applications. Part I: Off-line mass spectrometry techniques: MASS SPECTROMETRY OF Atmospheric Aerosols-PART I
    Mass Spectrometry Reviews, 2011
    Co-Authors: Kerri A. Pratt, Kimberly A Prather
    Abstract:

    Many of the significant advances in our understanding of Atmospheric particles can be attributed to the application of mass spectrometry. Mass spectrometry provides high sensitivity with a fast response time to probe chemically complex particles. This review focuses on recent developments and applications in the field of mass spectrometry of Atmospheric Aerosols. In Part I of this two-part review, we concentrate on off-line mass spectrometry techniques, which require sample collection on filters but can provide detailed molecular speciation. In particular, off-line mass spectrometry techniques utilizing tandem mass spectrometry experiments and high resolution mass analyzers provide improved insight into secondary organic aerosol formation and heterogeneous reaction pathways through detailed structural elucidation at the molecular level.

Tami C Bond - One of the best experts on this subject based on the ideXlab platform.

  • spectral absorption properties of Atmospheric Aerosols
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: Robert Bergstrom, P K Quinn, Peter Pilewskie, Jens Redemann, Tami C Bond, Philip B. Russell, Berko Sierau
    Abstract:

    We have determined the solar spectral absorption optical depth of Atmospheric Aerosols for specific case studies during several field programs (three cases have been reported previously; two are new results). We combined airborne measurements of the solar net radiant flux density and the aerosol optical depth with a detailed radiative transfer model for all but one of the cases. The field programs (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained Aerosols representing the major absorbing aerosol types: pollution, biomass burning, desert dust and mixtures. In all cases the spectral absorption optical depth decreases with wavelength and can be approximated with a power-law wavelength dependence (Absorption Angstrom Exponent or AAE). We compare our results with other recent spectral absorption measurements and attempt to briefly summarize the state of knowledge of aerosol absorption spectra in the atmosphere. We discuss the limitations in using the AAE for calculating the solar absorption. We also discuss the resulting spectral single scattering albedo for these cases.

  • Spectral absorption properties of Atmospheric Aerosols
    Atmospheric Chemistry and Physics Discussions, 2007
    Co-Authors: R. W. Bergstrom, P K Quinn, Peter Pilewskie, Jens Redemann, Tami C Bond, Philip B. Russell, Berko Sierau
    Abstract:

    We have determined the solar spectral absorption optical depth of Atmospheric Aerosols for specific case studies during several field programs (three cases have been reported previously; two are new results). We combined airborne measurements of the solar net radiant flux density and the aerosol optical depth with a detailed radiative transfer model for all but one of the cases. The field programs (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained Aerosols representing the major absorbing aerosol types: pollution, biomass burning, desert dust and mixtures. In all cases the spectral absorption optical depth decreases with wavelength and can be approximated with a power-law wavelength dependence (Absorption Angstrom Exponent or AAE). We compare our results with other recent spectral absorption measurements and discuss the limitations in using the AAE for calculating the solar absorption. We also discuss the resulting spectral single scattering albedo for these cases.

Philip B. Russell - One of the best experts on this subject based on the ideXlab platform.

  • spectral absorption properties of Atmospheric Aerosols
    Atmospheric Chemistry and Physics, 2007
    Co-Authors: Robert Bergstrom, P K Quinn, Peter Pilewskie, Jens Redemann, Tami C Bond, Philip B. Russell, Berko Sierau
    Abstract:

    We have determined the solar spectral absorption optical depth of Atmospheric Aerosols for specific case studies during several field programs (three cases have been reported previously; two are new results). We combined airborne measurements of the solar net radiant flux density and the aerosol optical depth with a detailed radiative transfer model for all but one of the cases. The field programs (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained Aerosols representing the major absorbing aerosol types: pollution, biomass burning, desert dust and mixtures. In all cases the spectral absorption optical depth decreases with wavelength and can be approximated with a power-law wavelength dependence (Absorption Angstrom Exponent or AAE). We compare our results with other recent spectral absorption measurements and attempt to briefly summarize the state of knowledge of aerosol absorption spectra in the atmosphere. We discuss the limitations in using the AAE for calculating the solar absorption. We also discuss the resulting spectral single scattering albedo for these cases.

  • Spectral absorption properties of Atmospheric Aerosols
    Atmospheric Chemistry and Physics Discussions, 2007
    Co-Authors: R. W. Bergstrom, P K Quinn, Peter Pilewskie, Jens Redemann, Tami C Bond, Philip B. Russell, Berko Sierau
    Abstract:

    We have determined the solar spectral absorption optical depth of Atmospheric Aerosols for specific case studies during several field programs (three cases have been reported previously; two are new results). We combined airborne measurements of the solar net radiant flux density and the aerosol optical depth with a detailed radiative transfer model for all but one of the cases. The field programs (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained Aerosols representing the major absorbing aerosol types: pollution, biomass burning, desert dust and mixtures. In all cases the spectral absorption optical depth decreases with wavelength and can be approximated with a power-law wavelength dependence (Absorption Angstrom Exponent or AAE). We compare our results with other recent spectral absorption measurements and discuss the limitations in using the AAE for calculating the solar absorption. We also discuss the resulting spectral single scattering albedo for these cases.